Science : Ch 11 – The Human Eye and the Colourful World

This test is designed based on NCERT Syllabus for Class 10 Topics : The Human Eye and the Colourful World

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

A clear sky appears blue, because:

blue light gets absorbed in the atmosphere

ultraviolet radiations are absorbed in the atmosphere

violet and blue lights get scattered more than the lights of all other colours by the atmosphere

lights of all other colours is scattered more than the violet and blue colour lights by the atmosphere

2 / 15

Which of the following statements is correct regarding the propagation of light of diferent colours of white light in air?

Red light moves the fastest.

Blue light moves faster than green light

All the colours of the white light travel with the same speed. (d)

Yellow light moves with the mean speed as that of red and the violet light.

3 / 15

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

is scattered the most by smoke or fog

is scattered the least by smoke or fog

is absorbed the most by smoke or fog

moves the fastest in air

4 / 15

Ankit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed and several observations can be explained on the basis of this phenomenon,name the phenomeoneon

Atmospheric refraction

Atmospheric reflection

Atmospheric dispersion

none

5 / 15

Why don’t planets twinkle?

Intensity of light entering our eye is infinity

Intensity of light entering our eye is one.

Intensity of light entering our eye is zero.

Intensity of light entering our eye is two.

6 / 15

What would have been the colour of sky if the earth had no atmosphere

white

dark

pink

no color

7 / 15

Power of a lens is

1/f

1/T

1/fT

none

8 / 15

Light which consists of only one colour or single wavelength is called Monochromatic

Single chromatic

Dichromatic

Monochromatic

none

9 / 15

The splitting of light into its component colours is called

Dispersion of light

Scattering of light

Refraction of light

Reflection of light

10 / 15

The defect the eye cannot focus objects both horizontally and vertically at the same time

Far – sightedness

Myopia

Astigmatism

none

11 / 15

Myopia can be corrected by using

convex lens

concave lenses

both concave and convex

none

12 / 15

A concave lens of short focal length has greater

Converging power than concave lens of long focal length

diverging power than convex lens of long focal length

diverging power than concave lens of long focal length

converging power than convex lens of long focal length

13 / 15

The SI unit of Power of a lens is

Hertz

Dipotre

newton

none

14 / 15

Visible spectrum is the band of coloured components of a

red light beam

white light beam

blue light beam

black light beam

15 / 15

The refractive index of glass is largest for

violet color

red color

blue color

white color

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Science : Ch 11 – The Human Eye and the Colourful World

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